Try to read some online article related to keywords research and use Google keyword planner then you can easily select good and useful keywords for your website.
signup for adwords to use google keyword planner and signup for bing webmaster tool to use bing keyword research tool. both are good tools for keyword research.
Google adwords keyword tool, wordtracker, Market Samurai etc you can get online list for keyword tools.
Here is an A-Z guide to keyword research: http://webmeup.com/seo-guide/keywords-and-rankings.html Hope it will help you.
The Google Keyword Planner is the best free tool for doing your keyword research. It gives you the amount of monthly searches and how fierce the competition is for advertising. There are paid options such as Market Samurai and LongTailPro, but the keyword planner should do the job for most things.
You should check out market samurai it's a very useful tool that many internet marketers use for keyword research.
1. Make a complete study about the page 2. Think of the keywords for the particular page in user point of view 3. Use keyword planner 4. Make use of google suggestion 5. Analyse Competitor Sites
First of all try to do some work regarding your keyword as in find out for which particular word/phrase you want to get indexed by the Search Engines. Check out for the competition and trends of the keyword you ought to select. There are many platforms available for help like Keyword planner, Google trends and lot more.